Piston or similar article



FIG. 1 is a front elevational view of a piston or similar article showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a bottom perspective thereof. 

The ornamental design for a piston or similar article, as shown and described. 